138275817 has 4 divisors (see below), whose sum is σ = 184367760. Its totient is φ = 92183876.

The previous prime is 138275803. The next prime is 138275827. The reversal of 138275817 is 718572831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138275817 - 2⁴ = 138275801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138275827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23045967 + ... + 23045972.

It is an arithmetic number, because the mean of its divisors is an integer number (46091940).

Almost surely, 2^138275817 is an apocalyptic number.

It is an amenable number.

138275817 is a deficient number, since it is larger than the sum of its proper divisors (46091943).

138275817 is an equidigital number, since it uses as much as digits as its factorization.

138275817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46091942.

The product of its digits is 94080, while the sum is 42.

The square root of 138275817 is about 11759.0738155690. The cubic root of 138275817 is about 517.1089776470.

The spelling of 138275817 in words is "one hundred thirty-eight million, two hundred seventy-five thousand, eight hundred seventeen".